This is a maintenance release. The following items were fixed and/or added:
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Virtualization core: Fixed performance issue observed with Windows XP guests on AMD hosts (6.0.0 regression; bug #19152)
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Virtualization core: Consistent IBRS/IBPB CPUID feature reporting, avoids crash of NetBSD 9.0 RC1 installer (bug #19146)
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GUI: Fixed updating of runtime info
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GUI: In Display settings, do not show "2D video acceleration" checkbox if it is meaningless for the selected graphics adapter
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Audio: Fixed audio input handling when VRDE is enabled
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Audio: Fixed crash in the HDA emulation when using multi-speaker configurations
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Storage: Fixed use of encrypted disks with snapshots involved (6.1.0 regression; bug #19160)
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Storage: Improve performance of virtio-scsi
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Storage: Read-only support for compressed clusters in QCOW2 images
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Windows installer: Include unintentionally dropped vbox-img.exe utility again
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Windows host: When installing or removing an extension pack, retry the sometimes failing directory renaming (usually caused by anti-virus software accessing the directory)
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Linux host: Support Linux 5.5 (guest additions not yet)
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Windows guest: Accelerate 2D video decoding (scaling and color space conversion) if the VM is configured to use VBoxSVGA with 3D enabled
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Windows guest: Fix guest additions installer to upgrade the mouse filter driver reliably
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Windows guest: When uninstalling older Guest Additions with old 3D support enabled try restoring original Direct3D files
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Linux guest: Improve resize and multi-monitor handling for VMs using VMSVGA (known remaining issue: do not disable a monitor "in the middle", causes confusion)